Exercise

• Aerobic respiration

  One of the two types of respiration, where oxygen is used to fully oxidise glucose
• Anaerobic respiration

  One of the two types of respiration, where glucose is oxidised without oxygen, leading to incomplete oxidation and a buildup of lactic acid
• During rest


  The body doesn't need a great deal of energy
• During exercise


  The body needs a great deal of energy for muscle contraction
• Body's reaction to increased energy demand during exercise

  1. Aerobic respiration increases

  2. Breathing rate and depth increase to get more oxygen

  3. Heart rate increases to pump oxygenated blood
• During vigorous exercise

  Anaerobic respiration takes place in the muscles
• Anaerobic respiration in muscles

  Leads to a buildup of lactic acid, causing muscle fatigue
• Oxygen debt

  The amount of extra oxygen the body needs after exercise to deal with the accumulated lactic acid
• Removing lactic acid after exercise

  1. Lactic acid is transported to the liver

  2. Lactic acid is converted back to glucose

  3. Requires oxygen